Oh boy my username sometimes you can find me with -TR or _TR.
First of all, this is and was not my first username. My first, that even Twitter still use, is Totenphal. I was 12 and didn't know how to write Totemphal, so for me it was done with this.
Then I wanted it to use nearly everywhere but couldn't use it so I needed another one. Zunder [This word is used in a German phrase "jemanden Zunder geben" = "to give someone hell"]
I used this in my Skype for instance and some other places.
Then I tried to register in an FPS, but both usernames already exists, so I needed a new one. Because I was 16 *cough not enough for that FPS cough*, I wanted to use a cool name. I wanted to use "Treter" [German for "Kicker"], but I had an typo with an n, so I ended up with Trenter [Shorten "Trent"] or sometimes TrenteR_TR.
The pronounciation is Tren-ter or Tren-ter T-R.